Preheated air construction for fluent fuel burning furnaces



May 29, 1956 STRAITZ 2,747,853

J. F. PREHEATED AIR CONSTRUCTION FOR FLUENT FUEL BURNING FURNACES Filed March 16, 1953 INVENTOR.

JOHN F. STRAITZ BY ATTORNEY United States Patent PREHEATED AIR CONSTRUCTION FOR FLUENT FUEL BURNING FURNACES .lohn F. Straitz, Philadelphia, Pa., assignor to National Air-oil Burner Company, Incorporated, Philadelphia, 1%., a corporation of Delaware Application March 16, 1953, Serial No. 342,512

6 Claims. (Cl. 263-51) This invention relates to a furnace floor construction and tile therefor.

It is the principal object of the present invention to provide an improved furnace floor construction and a tile for use therewith which has high heat absorption and reflecting capacity.

It is a further object of the present invention to provide an improved tile for use in furnace floors having a predetermined shape for increasing the heat absorbing and refiecting properties while at the same time reducing the weight of the tile for shipment.

It is a further object of the present invention to provide a tile for use in furnace floor constructions which may be quickly and easily assembled in position, which will provide the desired air port spacing in the floor and which will aid in the heating of the air supplied for combustion and thereby aid in the combustion of the fuel.

Other objects and advantageous features of the invention will be apparent from the specification and claims.

The nature and characteristic features of the invention will be more readily understood from the following description, taken in connection with the accompanying drawings forming part thereof, in which;

Figure l is a fragmentary sectional view of a portion of a furnace having a furnace floor and tile therein in accordance with the present invention;

Fig. 2 is a horizontal sectional view taken approximately on the line 2-2 of Fig. 1; and i Fig. 3 is a view in perspective of one of the tile units in accordance with the present invention.

It should, of course, be understood that the description and drawings herein are illustrative merely, and that various modifications and changes may be made in the structure disclosed without departing from the spirit of the invention.

Like numerals refer to like parts throughout the several views.

Referring now more particularly to Fig. l of the drawings, the furnace therein shown preferably includes a vertical front wall having one or more openings 11 therein for the reception of a fluent fuel burner 12 shown as an oil burner, although it will, of course, be understood that any other type of fluent fuel burner for the combustion of other kinds of fluent fuel may also be employed.

The furnace includes spaced parallel vertical side walls, one of which is shown at 13 and a vertical rear wall 14. Spaced upwardly from the horizontal foundation 15 on which the furnace is supported, and extending rearwardly from the front wall 10 in parallel relation to the side walls 13, a plurality of spaced horizontal supporting beams 16 are provided.

It will be noted that an air passageway 17 is enclosed between the side walls 13, in front of the rear wall 14, and below the supporting beams 16. At the front of the passageway 17, a frame 18 may be provided on which an air control door 19 is mounted, for controlling the air delivered into the passageway 17.

The supporting beams 16 are preferably provided with horizontal bars 20 secured at one of their narrower faces to and extending transversely with respect to the beams 16. The bars 20 extend from one side wall 13 to the other side wall of the furnace. The bars 20 are placed at predetermined spaced locations for supporting a plurality of tiles 21, hereinafter more fully described in spaced transverse rows and in end to end relation, and so as to provide between the rows of tile 21 transverse spaces 22 for the delivery of air thereabove.

Each of the tiles 21, one of which is shown more particularly in Fig. 3, preferably includes a body portion with a bottom wall 23 which may have a V-notch 24 extending therealong, for reducing the weight of the tile 21. At the outer margins of the bottom wall 23, a pair of parallel vertically upwardly extending longitudinal wall portions 25 are provided, and extending horizontally outwardly therefrom, a pair of longitudinal wall portions 26 are provided. The Wall portions 25 are adapted for reception between a pair of bars 29 with the tile body supported on the bars 20 by the wall portions 26. Spaced vertical side faces 27 are provided on each tile 21 which are connected by inwardly inclined faces 28. The faces 28 provide V-shaped notches in the side faces 27 of the tile 21. The tile 21 preferably is provided with an arcuatetop longitudinal wall or face 29 extending between the side faces 27, and with end walls 30.

The tile 21 each is preferably made from suitable refractory material capable of withstanding the temperatures of the combustion of the fuel thereabove.

The mode of use will, it is thought, be apparent from the foregoing. It may be noted, however, that fuel is intro duced through the burner 12, for combustion in the combustion space to the rear of the front wall 10, between the side walls 13 and above the rows of tiles 21. Air for supporting combustion, the quantity of which is determined by the induced draft in the furnace and the adjustment of the door 19, enters the passageway 17 and passes upwardly in the transverse spaces 22 between the rows of tiles 21 supported on the bars 20. As the air in the passageway 17 approaches the undersides of the tiles 21, and as it passes upwardly therebetween, it is preheated by the tiles 21 which tiles in turn, are heated by the combustion of the fuel in the furnace chamber thereabove. The surfaces 28 in the side walls 27 of the tiles 21 provide for increased area for heating the air passing between respective rows of tiles 21 while at the same time they impart some degree of turbulence to the air, moving upwardly. The top faces 29 permit a free and unhampered flow of the air for contact with the burning fuel, thereby aiding in the completion of combustion of the fuel.

I claim:

1. A furnace floor construction comprising a bottom wall, a plurality of horizontal spaced parallel bars spaced above said bottom wall, a plurality of refractory floor tile members in horiozntally spaced rows to provide spaced air delivery passageways extending upwardly from above said bottom wall, said tile members in each row having vertical ends in end to end relation to provide the row, said tile members having portions resting on a pair of adjoining bars in covering relation thereto and extending outwardly thereover and portions extending downwardly therebetween, the upper faces of said rows having the central portions elevated above the remaining portions thereof, and the side faces of the tile members above said first mentioned portions having horizontal grooves therein facing the passageways between said rows to provide enlarged heat transfer surfaces along said passageways.

2. A furnace floor construction comprising a bottom wall, a plurality of horizontal spaced parallel bars spaced above said bottom wall, a plurality of refractory floor tile members in horizontally spaced rows to provide spaced air delivery passageways extending upwardly from above said bottom wall, said tile members in each row having vertical ends in end to end relation to provide the row, said tile members having portions resting on a pair of adjoining bars in covering relation thereto and extending outwardly thereover and portions extending downwardly therebetween, the upper faces of said rows having the central portions elevated above the remaining portions thereof, the side faces of the tile mmebers above said first mentioned portions having horizontal grooves therein facing the passageways between said rows to provide enlarged heat transfer surfaces along said passageways, and the lower faces of said rows having notches therealong to increase the heat transfer surface thereof and decrease the weight of the tile members.

3. A furnace floor tile of a solid body of refractory material having a longitudinal horizontal bottom face, parallel vertical longitudinal inner side faces extending upwardly from said bottom face, oppositely disposed horizontal longitudinal faces extending outwardly from the upper margins of said side faces and and providing with said side faces supporting and positioning portions, outer 1ongitudinal side faces extending upwardly from the outer margins of said horizontal faces, said longitudinal faces having horizontal grooves therealong, and a longitudinal top face connecting the margins of said outer side faces, said top face having the central portions thereof elevated.

4. A furnace floor tile of a solid body of refractory material having a longitudinal horizontal bottom face, parallel vertical longitudinal inner side faces extending upwardly from said bottom face, oppositely disposed horizontal longitudinal faces extending outwardly from the upper margins of said side faces and providing with said side faces supporting and positioning portions, outer lon gitudinal side faces extending upwardly from the outer margins of said horizontal faces, said outer longitudinal side faces having meeting face portions providing horizontal grooves therealong, and a longitudinal transversely arcuate top face connecting the margins of said outer side faces.

5. A furnace floor tile of a solid body of refractory material having parallel vertical end faces, a horizontal longitudinal bottom face, parallel vertical longitudinal inner side faces extending upwardly from said bottom face, oppositely disposed horizontal longitudinal faces extending outwardly from the upper margins of said side faces and providing with said side faces supporting and positioning portions, outer longitudinal side faces extending upwardly from the outer margins of said horizontal faces, and a longitudinal transversely arcuate top face connecting the margins of said outer side faces, said bottom and outer side faces having longitudinal grooves therealong to increase the effective heat transfer area thereof.

6. A furnace floor tile of a solid body of refractory material having parallel vertical end faces, a horizontal longitudinal bottom face having an upwardly extending groove therealong, parallel vertical longitudinal inner side faces extending upwardly from said bottom face, oppositely disposed horizontal longitudinal faces extending outwardly from the upper margins of said side faces and providing with said side faces supporting and positioning portions, outer longitudinal side faces extending upwardly from the outer margins of said horizontal faces, said outer longitudinal side faces having meeting face portions providing horizontal grooves therealong, and a longitudinal top face connecting the margins of said outer side faces, said top face having the central portion thereof elevated.

References Cited in the file of this patent UNITED STATES PATENTS France Oct. 11, 

